Feature basic

This is a very basic implementation of a Python client library for MPower Payments.
There are no known issues/bugs at the moment, except for API calls that require approval/clearance from MPower.

I will soon update it to run on the various Python versions, including Python3+

## Note
- Tested on GNU/Linux 12.04 with Python 2.7.3
- All unit tests passed

Let me know how I can improve it.

Thanks!